Sterilized liquid dispensing device



y 1939: M. c. scHwAa 2,15%,314

STEBILIZED LIQUID DISPENSING DEVICE Filed March 17, 19:56 7 Sheets-Sheet 1 %rm 5 awa 7 May ,2, 1939. v M. c. SCHWAB STERILIZED LIQUID DISPENSING DEVICE Filed March 17, 1956 7 Sheets-Sheet 2 i- M c. SCHWAB 2,1563% STERILIZED LIQUID DISPENSING DEVICE Filed March '17, 1956 '7 Sheets-Sheet 3 May 2, 1939.

M. c. SCHWAB STERILIZED LIQUID DISPENSING DEVICE Filed March 17 1956 7 Sheets-Sheet 4 Mzkz C tibia/ ab.-

@fw 6M- May 2, 193 M. C1 SCHWAB 2,156,314

STERILIZED- LIQUID DISPENSING DEVICE" Y-Sheets-Sheet 5 Filed March 17, 1936 May 2, 1939. M. c. SCHWAB STERILIZED LIQUID DISPENSING DEVICE Filed March 17, 1956 7 Sheets-Sheet 6 May 2 1939. M. c. scHwAB STERILIZED LIQUID DISPENSING DEVI E Filed March 1'7. 1936 7 Sheets-Sheet 7 shuttle.

umrso oer-ice 2,156,3ld STZED LKQHIED DISPENSWG litllVli CE Martin 0. Schwab, Chicago, m; [application March 117, 1936, Serial No. 69,323 6 Claims. (cl. res-em) 'lhis invention relates to liquid dispensing apparatus of the general character referred to in my application serially numbered 750,392, filed October 27, 1934, that of my application serially numbered 698,544, filed November 17, 1933, now ,5 Patent No. 2,010,417, granted August 6, 1935, and that of my application seriallynumbered 58,649,

filed January. 11, 1936, and is directed to certain improvements thereover.

This invention is particularly directed to the go provision of a sterilized liquid dispensing apparatus having distinct advantages over my af rementioned applications and patent in that the present assembly is contrived to retain the liquid displaced from the final washing chamber at the 15 time of first placing the assembly in position for use as well as liquid added thereto and to control the amount of liquid returned to the final wash lug chamber. All of the liquid used in the washing is permanently segregated from the liquid so being dispensed. In addition, there is also the provision of a plurality of separate chambers either for additional washes orfor medication and they securing a sample of the washing liquid in order as to determine the bacterial count thereof. The accessibility of individual chambers also permits the removal of any sedimentation.

The amembly of my present device is readily sterilized and is capable of portable use as'well so as being sold as a part of the container. Other advantages of my invention, including the features embodied in my prior applications, reside in the association oi my invention, the dispensing assembly, and a container of sterilized liquid to so be administered by subcutaneous or intravenous injections. Further objects are to provide a construction of mammum simplicity, economy and ease of assembly and such further objects, ad vantages and capabilities as will later more fully appear and as are inherently possessed thereby.

My invention further resides in the combination, construction and arrangement of parts illustrated in the accompanying seven sheets of drawings, and while I have shown therein a preferred embodiment together with other embodiments, it is to be understood that the same are capable of further modifications and changes as are comprehensive to the details and construction I without departing from the spirit of my invention.

Referring to the drawings: Figure 1 is a vertical segtion of one embodiment of my invention showing. the dispensing device of my invention attached to a portion of a may also be used as means of readily.

re 2 is a plan view of my dispeg device taken on the line 2-2 of Figure l, and looking in the direction of the arrows.

Figure 3 is a vertical section of an embodiment of my invention separated from the screw base which attaches it to the bottle, with the addition of a small ball relief valve.

Figure 4 is a vertical section of another embodiment of my dispensing device. the wash chamber heing taken on the line 15- 3 of Figure 5, and looking in the direction of the arrows. Also, it should be noted that a portion of the inner wall is broken away to make the construction clearer. Figure 5 is a plan view of the wash chamber portion on the line ti$ of Figure l, loomng in the direction of the arrows.

Figure 6 is a vertical section of my dispensing device assembled ready for use, the cap portion of which is taken on the line 6--@ oi" Figure 7, looking in the direction of the arrows.

Figure '4" is a plan view of the Mow-v shown in Figure 6 of the cap portion only, taken on the line 'l-l and looking in the direction of the arrows.

Figure 8 is a vertical section of another embodiment of the cap portion only, with the dispensing tube in position.

Figure 9 is a vertical section oi still another embodiment, the can mrtion of which is taken on the line oi Figure 10, looking in the direction of the. arrows.

Figure 10 is a plan view of the can portion shown in Figure t taken on the line lt-Alfi and looking in the direction of the arrows. I

Figure ii is a vertical section of the overflow chamber taken on the line l'fl-ii oi Figure 9 and looking in the direction of the arrowaand shows the overflow chamber attached to the can portion.

Figure 12 is another embodiment of my invention in vertical section, taken on the line l2-l2 of Fig. 13 and looking in the direction of the arrows, and further showing bars in a cup-like formation and ready for use.

Figure 13 is a partial plan view taken on the line 83-43 of Figure 12, loo in the direction of the, arrows.

Figure 14 is a plan view of another emboditall the overflow chamment of the can portion only, sho the plurality of chain.

e 15 is a vertical section taken on the lines lid-it of Figure 1%. Figure 16 is a schematic representation of the operation of the embodiment shown in Figures 14. and 15..

Figure l? is stop plan view of another embodi- Figure 18 is a top plan view of another embodiment showing variations of the cap portion with respect to that of Figures 14 and 17.

Figure 19 is a'planview of another embodiment showing variations of the cap portion particularly with respect to Figures 1 and 2. w Figure 20 is a vertical section on the line 20-20 of Figure 19 looking in the direction of the arrows.

Figure 21 is a vertical section showing an embodiment with a variation in the base portion.

Like reference characters are used to designate similar parts in the drawings and in the de-' scrintion of theinvention which follows.

Referring more particularly to the drawings, my invention is illustrated in Figures 1 and 2. The dispensing device of my invention comprehends the use of a. bottle or container represented by the letter A which has the usual bottle-like body Ill and neck II which is provided with theprovided to secure water and air-tight sealing,

or any equivalent means maybe used. Communicating between the liquid in the container A to be dispensed and the wash chamber, there is a stub tube It exten only a short distance up into the neck of the bottle. The stub tube it may be extended up into the interior of the bottle or container id to a height even above the liquid level when the container is inverted in position for dispensing. in this manner only the liquid then in the tube It will be delivered to the wash chamber 2d and so foreclose any possibility of additional liquid being passed into the wash chamber and flooding it. The stub tube It is always of a sumc'ient height above the entrance iii of the dispensing tube I! so that there is no possibility of air or gas being short-circuited or passing over to and being carried by the flow of liquid passing out through the dispensing tube i1. This stub tube is made of metal or any other suitable material which can be readily sterilized. The tube for conveying the. liquid to be dispensed is indicated as W. This dispensing tube extends into the neck of the bottle only a. short distance and is secured to the base portion by a drive fit and aided by the shoulders i8, makes an air and water-tight joint. Obviously, this dispensing tube, which is made out of any suitable material which can be readily sterilized, may be inserted in the base portion by any other suitable means. At the outlet end of this dispensing tube, there are notches I9 which facilitate the air and liquid-tight attachment of the conveying tube 20. The cap portion 2! is screwed tightly to the base portion i3 by means of threaded aperture 22, a gasket 23 being interposed between the top .of the cap and the base in order to secure an air 6 and water-tight joint. Here again, equivalent means are fully contemplated; It will be noted that the dispensing tube l'l passes entirely through the cap portion 2!. I

The cap portion 2| being substantially hollow, there is provided an inner chamber 26 which I have termed the final wash chamber or wash chambers. Attached to and forming a part of the cap portion, there are one or more wing portions provided with another chamber 28, which I have termed the overflow chamber. This overflow chamber communicates with the wash chamber through the port 21. At the top 01' this overflow chamber I provide, optionally, a cap 28 provided with an opening 29 which is open to the atmosphere, or I may leave the entire overflow chamber 26 open. It is to be understood throughout that the term air includes other gases, as any suitable gas may be used. Also, Iprovide, optionally, a cleanout vent which is made accessible by the screw plug 30.

With the device as described and provided, the liquid is to be dispensed from the container A in substantial accordance with the following description. The complete assemblage after sterilization may be attached and form the capping portion of the bottle as sold or it may be attached at the point of dispensing. In either event, the bottle is inverted and held in position by a suitable holder. The liquid in the container A is held against flow by any suitable flow control means (not shown) such as a thumb clamp, for example, attached conveniently on the conveyor tube 2d.

Immediately upon the inversion of the bottle or other container A, some of the liquid will drip or flow from the tube is into the wash chamber 26% and thence through the port 21 into the overflow chamber 25 and will continue to do so until the atmospheric pressure exerted on the liquid in the overflow chamber 26, either through the open top or the vent 29 in the screw cap 28, equalizes the pressure built up in the wash chamber 26.

Upon releasing the flow control means (not shown) to convey the liquid to an injection needle, or for any pther purpose, surgical, industrial, or otherwise, the liquid flows by gravity from the container A downwardly through the dispensing tube ll, thence to the conveyor tube 20; When the level oi the liquid in the container A reaches the level of the opening 3! in the dispensing tube H, the flow ceases. Thus, the last one-half or three-quarters of an inch of liquid remains in the neck of the bottle, and is not dispensed. This isarranged intentionally to prevent any sediment or other mssible impurities from being carried to the patient.

As the bottle or other container empties, a partial vacuum is formed in the container in the space vacated by the liquid. Therefore, immediately upon the release of the flow control means, the pressures become unbalanced, and the atmospheric pressure in the overflow chamber 26 forces the liquid therein back through the port 21 and into the wash chamber 24 where it is trapped. The air bubbles up through this liquid and escapes upwardly through the stub tube i6, bubbling upwardly to the space vacated by the dispensing of the liquid. Of course, it the tube It extends to a point above the liquid level idly up through the trapped liquid in the wash chamber 24 with considerable ebullition and so receives a thorough washing and cleansing.

, Thus, when the air escapes up through the sterilint, foreign bodies or other material, including bacteria which may be entrained in the air and so will not contaminate the liquid;

It will be observed that none of the liquid which drips into the wash chamber 24 upon inverting the container and placing the assembly in use, which liquid is in turn forced into the overflow chamber 26 through the port Z'I, is lost. This serves two useful and important purposes among others. The overflow chamber collects the liquid and prevents it from not only being lost but eliminates any diiliculty of having the liquid spurt out into the open, or at least from wetting the floor. Also, by not losing this liquid 9, suflicient amount is thereby returned to the wash chamber 26 and so ensures a sufiicient and satisiactory wash and purification.

In the event the pressure in the wash chamber builds up too fast, or is excessive so that the liquid in the overflow chamber 26 is forced to a level at which it will overflow, I have provided a relief valve 32 which is shown in Figure 3 as the conventional type of relief valve. It is, of

a course, understood that any suitable type of valve may be used for this purpose.

It should also be noted in connection with the amount of the liquid returned to the wash chamher 2%, that there should be enough to secure the thorough washing and cleansing of the air but not'toomuch so that the violent ebullition might by any chance cause a splashing up through the stub tube it and so contaminate the liquid be ing dispensed. This I control by the overflow I chamber 28 so that only the proper amount of liquid is returned to the wash chamber 2%. The overflow chamber 26 may be made to hold only the amount of liquid, or less, which is to be returned to the wash chamber 25 or, since this over flow chamber 28 is open and accessible, any excess liquid not desired for washing is easilyremoved by any suitable means and so the control of the proper amount of liquid returned to the wash chamber 2% is accomplished.

if, for any reason, during the process of administering or dispensing the sterilized liquids, the physician or attendant should wish. to take a bacterial count of the liquid in the wash chamber all that is required is to heat or expand the air at the top of the container. This can be conveniently doneby placing a.- towel which has been wrung out in hot water, on the outside, and the resulting expansion of the air at the top on. the inside of the container will force, by transmission of pressure, some of the liquid out of the wash chamber 26 through the port 2? and into the overflow chamber 2t, from whence it can be removed by any convenient and well known means. In Figures 4. and 5 I have illustrated a com struction embodying all of the features of Figures 1 and 2, with this distinguishing characteristic that all of the chambers are included within the cap portion did. In this embodiment of my invention the container A may be of the same construction as that shown in fragment in Figure 1 as well as the base portion 83 and including the dispensing tube ll.

In this form of my invention the wash chamber Ma occupies only a little over one-half of the space available inside the cap portion Zia and is separated from two smaller chambers 33 and 3 3 by the bafi'ie Sta-which bameextends from the top to the bottom of the chamber Ma. The operation is similar to that previously described, but has additional features which are highly desirable.

Using this embodiment, immediately upon inversion of the container A some of the liquid will drip or flow therefrom through the tube It and into the wash chamber No. This liquid passes through the port 36 at the lower portion of the washing chamber 24a and into the overflow chamber 33. As this overflow chamber 33 begins to fill, there is a port 31 in the baflie 38 which separates the two smaller chambers 33 and 34, by means of which excess liquid is passed to the chamber where it is trapped and segregated during the remainder of the operation. The atmospheric pressure and the air to be cleansed in the washing chamber 25a is obtained through the port 39, passes through the chamber 34, through the port 31 in the bailleSB into the first overflow chamber and thence through the port 35 and bubbles up through the liquid returned to be retained in the wash chamber 2M.

Upon releasing the how control means (not shown), as before described, only the liquid which has been retained in the first overflow chamber 33 will be returned to the wash chamber 245a, as any excess has been carried through the port 31 into the second chamber 3% and there trapped. Thus it will be easily seen that the amount of liquid to be returned to the washchamber 2 5a may be determined by varying the size of the chamber 33, the height of the port 3? and the place of entrance of the port 35. By varying any one of these elements, only a measured amount of liquid will be returned to the washing chamber 2 311.

Referring now to the form of invention shown in Figures 6 and-'7, all of the features are identical to those shown in Figures 1- and 2 except that the wing portion 25b has two separate smaller chambers 26b and 26b. The chambers 26b and 28b are connected by the'duct db. Both of the chambers 2th and 262) have removable screw caps ii and d2 respectively, and there is a vent or port at in the upper part of the outside wall of the chamber 26!). In principle and in action this is identical with that described in connection with Figures 4 and 5 except that in the cap portion Bib the entire space of the chamber 261; is used for air filtering and washing.

In operation, immediately upon inversion of the container A a portion of the liquid therein flows or drips from the tube. it into the wash chamber 2% and thence through the duct 27b into the overflow chamber 2%. As this chamber 26b fills, excess'liquid will be transported through the duct into the second chamber 24%" where it is trapped and retained until the end of the operation. As soon as the flow control means is released, only that portion of the liquid retained in the overflow chamber Ebb will be returned via the duct 2?!) to the wash chamber 2%. It is obvious, therefore, that the amount of liquid returned from the chamber 2% to the wash chamber 2% may be controlled and. regulated by varying any one of the following three elements, i. e., the height of the location of the conduit -30, the size of the chamber 361) and also the point of entry of the duct 21b. This last variant is more clearly shown by reference to Figure 8 wherein the duct 21b is shown leaving the chamber Mb at approximately the bottom thereof and entering the chamber 28?) at a point approximately one-half of its length. I

It will be easily seen also that by removing the screw cap M before liquid is returned to the air washing chamber 2th the attendant may withdraw any portion of a liquid retained temporarily therein andadd medicaments or other antiseptics for cleansing and purifying the air passing through the air filter and wash chamber 24b.

It will also be noted that in Figure 6 the conduit 21b does not enter the wash chamber at its lowermost portion. It may be in some instances desirable to provide a sedimentation space at the bottom of the air filter and wash chamber 241) which will not be disturbed by the ebullltlon caused by the air bubbling up from the conduit 2117 through the liquid in the wash chamber 241). This sedimentation space is provided by regulating the height of the point of entryof the conduit 21b to the wash chamber.

In the embodiment of my device shown in Fig ures 9. 10 and 11, the essentials are identical with the disclosures and descriptions previously given,

particularly with reference to the Figures 1 and In the operation of this embodiment of my invention, when the assembly is in placeupon the outlet of the container with liquid to be dispensed, liquid flows or drips from the tube It into the washing chamber 240 and is transported therefrom through the conduit 210 into the first compartment 46. As this compartment fills, the overflow passes through the port 418 into the second chamber ii where it is trapped and re,- tained during the remainder of the operation. Immediately upon the release of the control means for regulating the flow of the liquid being dispensed, air is drawn in through the port d9 into the first compartment, through the port at in the bailie 55 down through the first compartment $5, thence through the conduit E'ic into the washing and filtering chamber 2 8e, upwardly throughthe liquid returned thereto from the compartment 66 and thence upwardly through the tube it. Here again the amount of liquid to be returned to the wash chamber 26c may be regulated by varying the size of the first compartment 66, their height of the port ifland the point of entrance of the conduit 270.

In Figures 12 and 13 I have illustrated another form of my said invention and it will readily. be seen from the drawings that the cap portion Zld is the only element which is changed physically, the operation being identical with that already described In this particular embodiment the cap portion 29d has been extended at the bottom portion thereof, and the annular wall 50 makes an open cup entirely surrounding the lowermost portion of the device. Theouter annular wall 50 and. the outer wall of the cap portion 2m form an open chamber 5|, a. portion of which is blocked ofi by baiiies 52 and 53 to form a smaller open chamber 54. The bafiie 52 is the same height as the annular wall 50, but the bafile 53 is lowered to permit the fiow of liquid from the chamber 5,3 to chamber 5|.

In the operation of this particular form of the invention, when the cap and base are placed in position onthe container with liquid to be dispensed, again a portion of the liquid flows or drips down through the tube It into the wash chamber 2% and passes out through the conconduit 60, up through the liquid in nary wash chamber 51 and is washed and filteredv duit2'ld into the chamber 54. This chamber 50 will fill up to the height of the'bailie 53, and any excess liquid flows over into the open chamber BI and is trapped there until the end of the operation, or may be readily removed. Upon releasing the fiow control means, as before described, only the liquid which has been tempo-' rarily retained in chamber 54 will be returned to the air filter or wash chamber 24d. Obviously, the amount of liquid returned thereto can readily be regulated by varying the size of the chamber 54 and varying the height of the baille 53.

In Figures 14 to 18, inclusive, I have illustrated my invention in various associated shapes showing multiple chambers. Multiple chambers often ofler advantages such as multiple washings which cannot be had by single air filter and washing chambers. In Figures 14 and 15 the cap portion Zle has the usual full size air filter and wash chamber 24c. Attached to and forming a part of the cap portion Me is an enlarged wing portion 55 in which there are three individual chambers 55, 51 and 58. All of these chambers are interconnected. .The wash chamber 24:; is connected to the overflow chamber 56 by bnduit 21c near the bottom portion thereof. The overflow chamber is connected to the secondary wash chamber 57 by the conduit 59 near the top portion thereof, and the secondary wash chamber 51 is connected to the secondary overflow chamber 58 by conduit 50. Chambers'56 and 51 are each covered by screw caps BI and B2 respecfivel'y. Chamber 58 is left open to the atmosphere. In this device the operator has an opportunity to secure an additional filtering and purifying. of the air by utilizing the secondary Wash chamber 51 in which may be placed a. liquid to preliminarily filter and-purify the air prior to the time it reaches the ultimate air filtering and wash chamber 258;

In operation and practice, using this form of the invention the cap and base are attached to the container in the manner as hereinbefore described. Upon placing the container in inverted position a portion of the liquid to be dispensed flows or drips into the wash chamber 24e and thence is conveyed through the conduit 21a to the overflow chamber 56. If too much liquid flows into the chamber 56 it will pass through conduit 59 and into the secondary wash chamber 51 where it may be retained or removed as desired. However, only the liquid temporarily retained in the chamber 56 is returned to the wash the action which takes place in this form of the invention, I have shown schematically in Figure 16 the various chambers and indicated a typical path or movement of air through the device up to the point of delivery to the container through the-tube l6 using the same reference numerals to indicate. similar parts In operation, the air comes in through the open tube of the chamber 58, then passes through the e prelimiin this passage. The air then proceeds through the conduit 59 into the overflow chamber 55 where it passes downwardly and is conducted through conduit 21c into the liquid inthe air filter and wash chamber Me and receives a second and final filtering and washing therein.

In the multiple chamber form represented schematically in Figure 16, the overflow chamber 56 and the duct 2le may be eliminated so that the wash occurs only in the chamber W. If this is done the liquid which drips or flows through the tube l6 will be retained in the cap portion lie but will not be used in washing as the air will pass through the duct 59 into the top portion of chamber 24c.

In Figures 17 and 18 I have shown simlilar multiple-chambered cap portions in plan where the separate chambers 56f, 511, and 58 in Figure 17 and 56g, 51g, and 589 in Eigure 18 are covered with a single screw cap, the screw threads for which are indicated as 83 and 66, respectively. The chambers 58] and 58g, both being covered, an air intake is provided in the outer'wall at 65 and 66, respectively. v

In the embodiment shown in Figures 19 and 20 it will be seen that the sides of the chambers 24h and 2671. have been straightened for aid in manufacture if this form is desired. This embodiment enlarges the liquid capacity of the lower part of the wash chamber 2th and if the volume of liquid, in operation, returned from the overflow chamber 26h does not bring the level of the liquid to a high enough point in the wash chamber to insure a thorough washingand filtering, a well 61 may be provided in the cap portion Zlh at the point of entry of conduit 2th. The provision of this well 6'! will give a sumcient column of liquid to give the necessary washing and filtering to the air or gas passing through.

It will be noted also in this embodiment that,

the bottom of the chamber 2th is slanted toward the conduit 21h. This has been done to secure fairly complete drainage of the chamber 26h upon the return of the liquid to the wash chamber 24h. The figure 2! shows a variation of the embodiment of the base portion which has been unchanged in the other figures. It will readily be seen that the base portion iBi is similar to the other disclosures herein except that a skirt portion 68, integral therewith, has been added. The skirt portion 68 extends down into the wash chamber 2 32' about two-thirds of the distance. Above, the joints between the cap portion and the base portion have been described as air and water tight. This has been done to'prevent the introduction of air or gas which has not been washed and filtered. As a further precaution the skirt 68 maybe added as shown. Possible air leakage between the base i335 and the cap 2H would be deflected downward between the inner wall of the one portion iii and the outer wall of the skirt 58. Any air or gas so leaking in would be so carried to a point below the level of the washing liquid in the chamber Eli, and so would be washed and cleansed before escape upwardly into the container.

Having thus described my invention and'illustrated its use, what I claim as new and desire to secure by Letters Patent is:

1. In combination with a container having an outlet and adapted to be inverted for discharging liquids therefrom, an air filter and fluid dispensing assembly comprisingtwo or more interconnesting overflow chambers and an air washing and filter chamber connected to one of said overflow chambers, and means for returning a predetermined amount of liquid permanently excluded from the liquid to be dispensed.

2. In combination with a container having an outlet and adapted to be inverted for discharging liquids therefrom, an air washing assembly adapted to be removably secured to the mouth of said container and comprising a dispensing tube centrally located in said assembly, an air washing chamber unconnected to said dispensing tube, anmoverflow chamber separate from said dispensing tube, and a conduit connecting said air washing chamber and said overflow chamber, said cbnduit leading into the lower portion of said washing-chamberand into an intermediate portion of said overflow chamber and adapted to return a predetermined amount of liquid to said air washing chamber upon dispensing of liquid in said container. 7

3. In combination with a container having a mouth and adapted to be invertedfor discharging substantially-pure liquids therefrom, an air washing and dispensing assembly adapted to be removably secured to the mouth of 'said container and comprising a dispensing duct centrally located in said assembly and extending into said container, an air washing chamber surrrounding said dispensing duct and separated therefrom, and an overflow chamber open to the atmosphere, separated from said dispensing duct, and a conduit connecting said overflow chamber and said air washing chamber at the lower portions of each chamber.

4. In combination with a container having an outlet and adapted to be inverted for discharging liquid therefrom, an air washing and dispensing assembly removably secured to said outlet and comprising a dispensing tube extendin into said container, an air washing chamber separated from said dispensing tube, an overflow chamber open to the atmosphere and connected to said air washing chamber, and a second tube leading from said air washing chamber into said container and extending further into said container than said dispensing tube.

5. In combination with a container having an outlet and adapted to be inverted for discharging liquids therefrom, an air washing assembly adapted to be removably secured to the outlet of said container and comprising a cap portion and a wing portion, a dispensing tube centrally located in said cap portion, an air washing chamher in said cap portion unconnected to said dispensing tube, a plurality of interconnected overfiow chambers in said wing portion, and a conduit leading from one of said overflow chambers to said air washing chamber adapted to return a controlled amount of liquid to said air washing ici'iamber-upon dispensing of the liquid in said' chamber, said overflow chamber being divided into a plurality of compartments by baiiles, one

- of said baflles being lower-than the other to permit flow of wash liquid thereover, and a conduit connecting said overflow chamber and said air washing chamber.

. MARTIN 0.;SCHWAE- 

